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DS3906 Datasheet

  • DS3906

  • Triple NV Low Step Size Variable Resistor Plus Memory

  • 14頁

  • MAXIM   MAXIM

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Rev 0; 4/05
Triple NV Low Step Size Variable
Resistor Plus Memory
General Description
The DS3906 is intended for low resistance, small step-
size applications. It contains three nonvolatile (NV), low-
temperature coefficient, variable digital resistors that
are capable of ohm and subohm increments when
used in parallel with a fixed external resistor. All three of
the DS3906鈥檚 resistors have 64 positions (plus a high-Z
state) with a pseudo-log response cleverly chosen to
have a linear equivalent resistance when paired with an
external resistor (see graphs below). The DS3906 also
contains 16 bytes of user EEPROM that, in addition to
the resistors, are controlled through an I
2
C鈩?compati-
ble serial interface. Three address pins allow up to
eight DS3906s to be placed on the same I
2
C bus.
The DS3906 can also be factory cutomized to provide a
variety of transfer functions depending on user
requirements. Contact mixedsignal.apps@dalsemi.com
for additional information.
Features
鈾?/div>
Three Programmable Resistors for Low Step-Size
Applications (Ohm and Subohm)
鈾?/div>
Resistor Settings are NV
鈾?/div>
16-Byte NV User Memory (EEPROM)
鈾?/div>
I
2
C-Compatible Serial Interface
鈾?/div>
Up to 8 Devices Can be Multidropped on the
Same I
2
C Bus
鈾?/div>
Low Power Consumption
鈾?/div>
Wide Operating Voltage (2.7V to 5.5V)
鈾?/div>
Operating Temperature Range: -40擄C to +85擄C
DS3906
Ordering Information
PART
DS3906U
DS3906U+
TEMP RANGE
-40擄C to +85擄C
-40擄C to +85擄C
PACKAGE
10-Pin 碌SOP
10-Pin 碌SOP
Applications
Low Ohm, Fine Resolution Driver Control for LED
Display Panels
Low Ohm, Fine Resolution Instrumentation Control
+Denotes
lead-free package.
Add 鈥?T&R鈥?for Tape-and-Reel orders
Pin Configuration
TOP VEIW
A1 1
SDA 2
SCL 3
10 A2
9
A0
H0
H1
H2
Typical Operating Circuit appears at end of data sheet.
V
CC
GND
4
5
DS3906
8
7
6
10-PIN
碌SOP
Resistor Plots
RESISTOR 0 AND 1 RESISTANCE vs. POSITION
(WITH AND WITHOUT EXTERNAL RESISTOR)
200
180
R
EFFECTIVE
= R
0, 1
|| R
EXT
(鈩?
160
140
120
100
80
60
40
20
0
0
16
32
20
R
0, 1
WITHOUT R
EXT
48
64
0
R2
R
EXT2
50
0
0
16
32
48
64
RESISTOR POSITION (dec)
R
0, 1
|| (R
EXT
= 50鈩?
100
500
R
0, 1
|| (R
EXT
= 105鈩?
R
0, 1
|| (R
EXT
= 150鈩?
R
0, 1
WITHOUT R
EXT
(鈩?
2000
1500
3000
2500
R
EFFECTIVE
= R
2
|| R
EXT
(鈩?
R0
R
EXT0
RESISTOR 2 RESISTANCE vs. POSITION
(WITH AND WITHOUT EXTERNAL RESISTOR)
350
R
2
|| (R
EXT
= 400鈩?
300
250
200
1000
150
100
R
2
WITHOUT R
EXT
600
400
R
2
|| (R
EXT
= 250鈩?
800
R
2
|| (R
EXT
= 310鈩?
1400
1200
R
2
WITHOUT R
EXT
(鈩?
1600
DS3906
R1
R
EXT1
RESISTOR POSITION (dec)
I
2
C is a trademark of Philips Corp. Purchase of I
2
C components of Maxim Integrated Products, Inc., or one of its sublicensed
Associated Companies, conveys a license under the Philips I
2
C Patent Rights to use these components in an I
2
C system, provided
that the system conforms to the I
2
C Standard Specification as defined by Philips Corp.
______________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.

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